Cisco Catalyst 2960 Command Reference Manual page 648

debug spanning-tree
Usage Guidelines
The undebug spanning-tree command is the same as the no debug spanning-tree command.
Related Commands Command
show debugging
show spanning-tree
Catalyst 2960 Switch Command Reference
B-56
Description
Displays information about the types of debugging that are enabled. For
syntax information, select Cisco IOS Release 12.2 Configuration Guides
and Command References > Cisco IOS Configuration Fundamentals
Configuration Guide, Release 12.2 > System Management >
Troubleshooting and Fault Management.
Displays spanning-tree state information.
Appendix B Catalyst 2960 Switch Debug Commands
78-16882-01